US3710585A - Method and apparatus for removing moisture from a refrigeration system - Google Patents

Method and apparatus for removing moisture from a refrigeration system Download PDF

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Publication number
US3710585A
US3710585A US00132033A US3710585DA US3710585A US 3710585 A US3710585 A US 3710585A US 00132033 A US00132033 A US 00132033A US 3710585D A US3710585D A US 3710585DA US 3710585 A US3710585 A US 3710585A
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vapor
moisture
refrigerant
stream
shell
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US00132033A
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W Dillenbeck
P Muench
E Walker
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York International Corp
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Borg Warner Corp
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Assigned to YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE reassignment YORK INTERNATIONAL CORPORATION, 631 SOUTH RICHLAND AVENUE, YORK, PA 17403, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BORG-WARNER CORPORATION
Assigned to CANADIAN IMPERIAL BANK OF COMMERCE reassignment CANADIAN IMPERIAL BANK OF COMMERCE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YORK INTERNATIONAL CORPORATION
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass

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  • An improved method and apparatus for purging moisture from a refrigeration system includes means for withdrawing a mixture of refrigerant vapor and moisture from the system, removing moisture from this mixed stream and then reintroducing the dried vapor into said evaporator, all of said operation taking place during a normal shutdown period of said system.
  • This invention relates to apparatus and a method for removing undesirable moisture from a refrigeration system, particularly the closed circuit, vapor cycle type in which a flooded evaporator or shell and tube condenser are employed.
  • refrigerant driers operate continuously while the compressor is running, such as by continuously passing refrigerant vapor (and entrained moisture) through a chemical drier to adsorb moisture or, as in the case of Etherington, periodically withdrawing the stream and subsequently regenerating the desiccant.
  • FIG. 1 is a schematic drawing disclosing a typical water chiller and including the improved means for drying refrigerant which is withdrawn from the vapor space of the evaporator;
  • FIG. 2 is a view similar to FIG. 1 showing a modification of the invention.
  • FIG. 1 shows a typical vapor cycle refrigeration system including a centrifugal compressor 10, a condenser 12, an expansion device 14 and an evaporator 16.
  • the refrigerant vapor is compressed by the compressor and conducted to condenser 12 by means of a conduit 20.
  • the liquid refrigerant flows to the expansion device by means of passages 22 and the low pressure refrigerant passes into the evaporator shell through passage 24.
  • the vapor is delivered to the suction side of the compressor through conduit 26.
  • the evaporator described herein is of the flooded type in which the tube bundle 30 in shell 31 is.at least partly submerged in a body of liquid refrigerant, the level of which normally varies (depending on the load) around the line indicated at 32.
  • the improvement of the present invention comprises means connected to the upper portion of the evaporator shell for withdrawing a stream of refrigerant vapor containing moisture and for drying the same.
  • a heater element 38 is operatively associated with a conduit 39 which has its entrance end located at 40 and its exit end located at 42.
  • a drier element 44 which may be either of the disposable or regenerative type, is located in conduit 39 to adsorb water as the stream passes through it.
  • the heater element is energized only during shutdown of the system when the moisture tends to migrate into the upper space above the tube bundle.
  • the heat energy applied to the conduit by the heater causes a convective movement of vapor from the entrance 40 to the exit 42 through the drier element.
  • a mechanical vapor flow inducing element such as blower 50
  • blower 50 is substituted for the heater.
  • the blower is energized, causing the refrigerant vapor and moisture to circulate through the line, only when the system is shut down.
  • refrigerant drier means refrigerant drier means; and means for circulating a stream of refrigerant vapor and moisture through said drier means from the vapor space of said system during periods when the system is not in operation.
  • said means for circulating said stream includes conduit means connecting said system and said refrigerant drier means in a closed circuit fluid path, and a heater element adapted to induce circulation of vapor through said conduit means and said drier.
  • Apparatus as defined in claim 1 wherein said means for circulating said stream includes a blower in said conduit means.
  • a method of removing moisture from a refrigeration system of the type utilizing a flooded evaporator including an evaporator shell, a tube bundle in said shell, and a body of refrigerant therein, the refrigerant level being below the upper portion of said shell; the steps which include withdrawing a stream of refrigerant vapor and moisture only during periods when said of refrigerant vapor and moisture from said condenser only during periods when said system is not in operation, removing moisture from said vapor and moisture stream and returning the dried refrigerant vapor to said condenser.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)

Abstract

An improved method and apparatus for purging moisture from a refrigeration system includes means for withdrawing a mixture of refrigerant vapor and moisture from the system, removing moisture from this mixed stream and then reintroducing the dried vapor into said evaporator, all of said operation taking place during a normal shutdown period of said system.

Description

United States Patent 1191 Dillenbeck et al. 1 1 Jan. 16, 1973 54 METHOD AND APPARATUS FOR 2,509,787 5/1950 Shoemaker ..02/474 REMOVING MOISTURE FROM A 2,6l3,534 l0/l952 Schreiber ....62/474 3,013,404 l2/l96l Endress ..02 85 REFRIGERATION SYSTEM 3,205,679 9/1965 Geist 02/474 Inventors: Warren H. Dillenbeck, York, Pa.; Paul W. Muench, Medford Lakes, N.J.; Elmo R. Walker, York, Pa.
ooooooooo 0000000 [000 Primary Examiner-William J. Wye Atlorney-Donald W. Banner, William S. Mc(urry and John W. Butcher ABSTRACT An improved method and apparatus for purging moisture from a refrigeration system includes means for withdrawing a mixture of refrigerant vapor and moisture from the system, removing moisture from this mixed stream and then reintroducing the dried vapor into said evaporator, all of said operation taking place during a normal shutdown period of said system.
5 Claims, 2 Drawing Figures PMENIED JAN 16 I975 3 J 4 N o 000 00 00000000 000 0 0 0 0 0 00 0 o o S ooooooo 00000 000 ooo METHOD AND APPARATUS FOR REMOVING MOISTURE FROM A REFRIGERATION SYSTEM BACKGROUND OF THE INVENTION 1. Field of the Invention Purging apparatus and methods for removing moisture from refrigeration systems, particularly flooded evaporators.
2. Description of Prior Art US. Pat. No. 2,951,349 issued to T. L. Etherington discloses means for taking a portion of the refrigerant being introduced into the suction side of a compressor and removing moisture by a chemical absorber.
SUMMARY OF THE INVENTION This invention relates to apparatus and a method for removing undesirable moisture from a refrigeration system, particularly the closed circuit, vapor cycle type in which a flooded evaporator or shell and tube condenser are employed. v
In refrigeration systems using a halocarbon refrigerant, it is extremely important to keep moisture out of the refrigerant circulatory system, because moisture causes the refrigerant to break down and increases the corrosion of metal parts in contact with the refrigerant, particularly the tube bundles and compressor working spaces. The problem is most acute when using refrigerants which evaporate at subatmospheric pressures, because even the smallest leak in the system allows entry of humid air. Centrifugal water chilling machines, which generally use R-ll refrigerant, are typical of subatmospheric systems.
Most refrigerant driers operate continuously while the compressor is running, such as by continuously passing refrigerant vapor (and entrained moisture) through a chemical drier to adsorb moisture or, as in the case of Etherington, periodically withdrawing the stream and subsequently regenerating the desiccant.
It has been found that these approaches are not as effective as they might be; because liquid and vapor samples taken from the system, during machine operation, are almost always dry. It is possible that the water in the system migrates to the liquid surface in the evaporator where it is difficult to remove. However, when the machine is shut down, the water evaporates and a high concentration of moisture is found in the refrigerant vapors throughout the system.
It is an object of the present invention to provide means for withdrawing moist refrigerant vapor in a stream from the vapor space of the system, drying it and then reintroducing the dried refrigerant into the vapor space, all during a period of shutdown.
DETAILED DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic drawing disclosing a typical water chiller and including the improved means for drying refrigerant which is withdrawn from the vapor space of the evaporator; and
FIG. 2 is a view similar to FIG. 1 showing a modification of the invention.
DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows a typical vapor cycle refrigeration system including a centrifugal compressor 10, a condenser 12, an expansion device 14 and an evaporator 16. In operation, the refrigerant vapor is compressed by the compressor and conducted to condenser 12 by means of a conduit 20. The liquid refrigerant flows to the expansion device by means of passages 22 and the low pressure refrigerant passes into the evaporator shell through passage 24. The vapor is delivered to the suction side of the compressor through conduit 26.
It will be noted that the evaporator described herein is of the flooded type in which the tube bundle 30 in shell 31 is.at least partly submerged in a body of liquid refrigerant, the level of which normally varies (depending on the load) around the line indicated at 32.
The improvement of the present invention comprises means connected to the upper portion of the evaporator shell for withdrawing a stream of refrigerant vapor containing moisture and for drying the same. In one form of the invention shown in FIG. 1, a heater element 38 is operatively associated with a conduit 39 which has its entrance end located at 40 and its exit end located at 42. A drier element 44, which may be either of the disposable or regenerative type, is located in conduit 39 to adsorb water as the stream passes through it. The heater element is energized only during shutdown of the system when the moisture tends to migrate into the upper space above the tube bundle. The heat energy applied to the conduit by the heater causes a convective movement of vapor from the entrance 40 to the exit 42 through the drier element.
In the modified system shown in FIG. 2, the same reference numerals are applied to identical elements. In this case, a mechanical vapor flow inducing element, such as blower 50, is substituted for the heater. Again, the blower is energized, causing the refrigerant vapor and moisture to circulate through the line, only when the system is shut down.
While the invention has been described in connection with a certain specific embodiment thereof, it is to be understood that this is by way of illustration and not by way of limitation. For example, the drier could as well be applied to the condenser vapor space. The scope of the appended claims should be construed as broadly as the prior art will permit.
What is claimed is:
1. In a refrigeration system of the closed circuit, vapor cycle type, the improvement comprising refrigerant drier means; and means for circulating a stream of refrigerant vapor and moisture through said drier means from the vapor space of said system during periods when the system is not in operation.
2. Apparatus as defined in claim 1 wherein said means for circulating said stream includes conduit means connecting said system and said refrigerant drier means in a closed circuit fluid path, and a heater element adapted to induce circulation of vapor through said conduit means and said drier.
3. Apparatus as defined in claim 1 wherein said means for circulating said stream includes a blower in said conduit means.
4. A method of removing moisture from a refrigeration system of the type utilizing a flooded evaporator including an evaporator shell, a tube bundle in said shell, and a body of refrigerant therein, the refrigerant level being below the upper portion of said shell; the steps which include withdrawing a stream of refrigerant vapor and moisture only during periods when said of refrigerant vapor and moisture from said condenser only during periods when said system is not in operation, removing moisture from said vapor and moisture stream and returning the dried refrigerant vapor to said condenser.

Claims (5)

1. In a refrigeration system of the closed circuit, vapor cycle type, the improvement comprising refrigerant drier means; and means for circulating a stream of refrigerant vapor and moisture through said drier means from the vapor space of said system during periods when the system is not in operation.
2. Apparatus as defined in claim 1 wherein said means for circulating said stream includes conduit means connecting said system and said refrigerant drier means in a closed circuit fluid path, and a heater element adapted to induce circulation of vapor through said conduit means and said drier.
3. Apparatus as defined in claim 1 wherein said means for circulating said stream includes a blower in said conduit means.
4. A method of removing moisture from a refrigeration system of the type utilizing a flooded evaporator including an evaporator shell, a tube bundle in said shell, and a body of refrigerant therein, the refrigerant level being below the upper portion of said shell; the steps which include withdrawing a stream of refrigerant vapor and moisture only during periods when said system is not in operation, removing moisture from said vapor and moisture stream and returning the dried refrigerant vapor to the evaporator shell.
5. A method of removing moisture from a refrigeration system of the type utilizing a shell and tube condenser, the steps which include withdrawing a stream of refrigerant vapor and moisture from said condenser only during periods when said system is not in operation, removing moisture from said vapor and moisture stream and returning the dried refrigerant vapor to said condenser.
US00132033A 1971-04-07 1971-04-07 Method and apparatus for removing moisture from a refrigeration system Expired - Lifetime US3710585A (en)

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JP (1) JPS5529344B1 (en)
AU (1) AU466919B2 (en)
CA (1) CA957522A (en)
DE (1) DE2214578C3 (en)
FR (1) FR2132791B1 (en)
GB (1) GB1375315A (en)
IT (1) IT950747B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267705A (en) * 1979-09-12 1981-05-19 Carrier Corporation Refrigeration purging system
US4531375A (en) * 1984-05-14 1985-07-30 Carrier Corporation Purge system monitor for a refrigeration system
US20070028647A1 (en) * 2005-08-04 2007-02-08 York International Condenser inlet diffuser

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3425735C2 (en) * 1984-07-12 1986-07-10 Danfoss A/S, Nordborg Refrigerant dryer for a refrigeration system
US4683724A (en) * 1985-10-28 1987-08-04 V. M. International, Inc. Refrigeration moisture eliminating device and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2400620A (en) * 1945-01-18 1946-05-21 Worthington Pump & Mach Corp Purging system for refrigerating systems
US2509787A (en) * 1949-01-28 1950-05-30 Philco Corp Dehydration of refrigeration systems
US2613534A (en) * 1952-10-14 Method of testing for excess mois
US3013404A (en) * 1960-01-04 1961-12-19 Carrier Corp Purge mechanism for refrigeration system
US3205679A (en) * 1961-06-27 1965-09-14 Air Prod & Chem Low temperature refrigeration system having filter and absorber means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE354549A (en) *
US3131548A (en) * 1962-11-01 1964-05-05 Worthington Corp Refrigeration purge control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2613534A (en) * 1952-10-14 Method of testing for excess mois
US2400620A (en) * 1945-01-18 1946-05-21 Worthington Pump & Mach Corp Purging system for refrigerating systems
US2509787A (en) * 1949-01-28 1950-05-30 Philco Corp Dehydration of refrigeration systems
US3013404A (en) * 1960-01-04 1961-12-19 Carrier Corp Purge mechanism for refrigeration system
US3205679A (en) * 1961-06-27 1965-09-14 Air Prod & Chem Low temperature refrigeration system having filter and absorber means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267705A (en) * 1979-09-12 1981-05-19 Carrier Corporation Refrigeration purging system
US4531375A (en) * 1984-05-14 1985-07-30 Carrier Corporation Purge system monitor for a refrigeration system
US20070028647A1 (en) * 2005-08-04 2007-02-08 York International Condenser inlet diffuser

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AU466919B2 (en) 1973-08-30
JPS5529344B1 (en) 1980-08-02
DE2214578A1 (en) 1972-10-19
DE2214578C3 (en) 1978-10-19
CA957522A (en) 1974-11-12
FR2132791A1 (en) 1972-11-24
IT950747B (en) 1973-06-20
AU3932672A (en) 1973-08-30
DE2214578B2 (en) 1978-01-26
GB1375315A (en) 1974-11-27
FR2132791B1 (en) 1974-10-18

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